package com.exp2.exp2;


import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.event.ApplicationEventMulticaster;
import org.springframework.context.event.SimpleApplicationEventMulticaster;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.stereotype.Component;

//只要有注解对应，这些类，方法放哪里都能被找到
//对应文件：ApplicationEventMulticaster 和 AbstractApplicationContext
@Configuration
public class LocalEvent {
    //自定义的事件发布器
    @Bean(AbstractApplicationContext.APPLICATION_EVENT_MULTICASTER_BEAN_NAME)
    ApplicationEventMulticaster localApplicationEventMulticaster(ThreadPoolTaskExecutor taskExecutor){
        SimpleApplicationEventMulticaster eventMulticaster = new SimpleApplicationEventMulticaster();
        eventMulticaster.setTaskExecutor(taskExecutor);
        return eventMulticaster;
    }

    //自定义事件类
    static class NoticeEvent extends ApplicationEvent {

        private static final Logger logger= LoggerFactory.getLogger(NoticeEvent.class);

        //存储信息
        private final String message;

        public NoticeEvent(String message){
            super(message);
            this.message = message;
            logger.info("添加事件成功！message:{}",message);
        }
        public String getMessage(){ return message; }
    }

    //自定义的事件监听器，监听{@link NoticeEvent}
    @SuppressWarnings("unused")
    @Component
    static class NoticeListener implements ApplicationListener<NoticeEvent> {

        private static final Logger logger = LoggerFactory.getLogger(NoticeEvent.class);

        @Override
        public void onApplicationEvent(NoticeEvent noticeEvent) {
            //System.out.println("监听测试");
            logger.info("事件监听器获取到 noticeEvent 睡眠当前线程2秒...");

            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            logger.info("NoticeEvent 的 message 属性是 :{}", noticeEvent.getMessage());

        }
    }

}
